[RFC PATCH] lscpu: get more infomation when using "/sys/firmware/dmi/entries/4-0/raw"

[Huang Shijie <shijie@os.amperecomputing.com>]

This patch gets more infomation for "BIOS Model name"
from the file "/sys/firmware/dmi/entries/4-0/raw"

Before this patch, we can get the output from Centos 7.9:
  ----------------------------------------------------
  BIOS Vendor ID:                  Ampere(TM)
  Model name：                     Neoverse-N1
    BIOS Model name:               Ampere(TM) Altra(TM) Processor
  ----------------------------------------------------

 After this patch, in Centos 7.9, we get:
  ----------------------------------------------------
  BIOS Vendor ID:                  Ampere(TM)
  Model name：                     Neoverse-N1
    BIOS Model name:               Ampere(TM) Altra(TM) Processor Q00-00 CPU @ 2.8GHz
  ----------------------------------------------------

Signed-off-by: Huang Shijie <shijie@os.amperecomputing.com>
---
 sys-utils/lscpu-arm.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/sys-utils/lscpu-arm.c b/sys-utils/lscpu-arm.c
index 885aadc36..1af689649 100644
--- a/sys-utils/lscpu-arm.c
+++ b/sys-utils/lscpu-arm.c
@@ -317,6 +317,8 @@ static int arm_rXpY_decode(struct lscpu_cputype *ct)
 
 #define PROC_MFR_OFFSET		0x07
 #define PROC_VERSION_OFFSET	0x10
+#define PROC_CURRENT_SPEED	0x16
+#define PROC_PART_NUM		0x22
 
 /*
  * Use firmware to get human readable names
@@ -324,7 +326,8 @@ static int arm_rXpY_decode(struct lscpu_cputype *ct)
 static int arm_smbios_decode(struct lscpu_cputype *ct)
 {
 	uint8_t data[8192];
-	char buf[128], *str;
+	char buf[128], *str, *str1;
+	uint16_t current_speed;
 	struct lscpu_dmi_header h;
 	int fd;
 	ssize_t rs;
@@ -348,8 +351,12 @@ static int arm_smbios_decode(struct lscpu_cputype *ct)
 	}
 
 	str = dmi_string(&h, data[PROC_VERSION_OFFSET]);
-	if (str) {
-		xstrncpy(buf, str, 127);
+	str1 = dmi_string(&h, data[PROC_PART_NUM]);
+	current_speed = *((uint16_t *)(&data[PROC_CURRENT_SPEED]));
+	if (str || str1) {
+		snprintf(buf, sizeof(buf), "%s %s CPU @ %d.%dGHz",
+			(str ?: ""), (str1 ?: ""),
+			current_speed / 1000, (current_speed % 1000) / 100);
 		ct->bios_modelname = xstrdup(buf);
 	}
 
-- 
2.30.2